const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server  = http.createServer((req, res)=>{
  // console.log(req);//打印的结果在命令行面板中
  // console.log(res);
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World\n');//返回在浏览器界面上
})
server.listen(port, hostname, ()=>{
    console.log(`服务器运行在http://${hostname}:${port}`)
})
